Why did he suddenly lose interest?

I’m 41 and and the man I met is 39. This man I met through a friend consistently approached me until i gave in. So we went out a couple of times and the chemistry grew more and more between us. Him and I are both divorced and have kids which made us connect even more. During the time we were getting to know each other he’d ring me roughly 6 times a day or more and i would ring him also, so this showed me that he really did want a relationship. I began to really think i had a future with him. every second weekend we’d catch until his ex-wife went overseas for a holiday and things changed. He had to look after his children for three months and I only saw him twice within the three months. His attitude changed gradually whilst his ex-wife was overseas and he’d say I dont want a relationship, I dont know what happened or what I did wrong. I knew that I should give him a little break because of the pressure of looking after his children, but then after awhile my patients ran out. I’d call him and he would say that he didnt want a relationship. How can that be if he was the one who was consistenly ringing me and wanted to catch up with me from the start? Then i called him after a couple of months and said don’t call me anymore. It was as though we weren’t in a relationship from the start when we were. We had the chemistry and everything else, so what happened? It’s been over 7 months now and there hasn’t been any communication between us.